Is simply "Glitch- Spawn of Bungie". I mean, he can throw a detain shield around you in the raid even if you're teleported, he can cause the relic bubble to be as effective as saran wrap, and he can give whatever enemy he likes infinite health. It seems as though praetorians and hobgoblins are his favorites. Or, if he just doesn't like you, he'll just boot you out of the damn game.
I can't believe Bungie has the capability to produce such a difficult boss.
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I thought the hardest boss was RNGesus.